JPS5821168B2 - liquid fuel combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid fuel combustion device with a set of vaporizing burners using petroleum fuel.

Conventionally, many liquid fuel combustion devices with a vaporizing burner set use a heater to vaporize the fuel.

For example, a heater is provided around the vaporization cylinder to heat a premixing chamber inside the vaporization cylinder, and the fuel is rotary sprayed into the premixing chamber to vaporize it, and combustion air is sent in to premix it. A blue flame was burning on the upper flame hole plate.

In some cases, the capacity of the heating heater is reduced when the vaporizing cylinder reaches a state where it is heated by combustion heat.

However, devices that use heaters in this way have the disadvantage that they require a long preheating time to reach the vaporization temperature, and do not reach vaporization combustion in a short time. However, this method required a large-capacity heater and had the disadvantage that it was not practically applicable.

An object of the present invention is to provide a liquid fuel combustion device that eliminates the above drawbacks without using a heater, instantly achieves blue flame vaporization combustion, and can be applied to high-output combustion devices.

That is, the gist of the present invention is that an inner cylinder smaller than the outer cylinder is installed in a bottomed outer cylinder at intervals from the side surface, bottom surface, and opening surface of the outer cylinder, and the upper side surface of the outer cylinder The liquid fuel combustion device is characterized in that an air supply pipe is connected to the inner cylinder upwardly, and a fuel spray nozzle is provided at the bottom of the outer cylinder facing into the cabinet.

Next, the liquid fuel combustion apparatus of the present invention will be explained with reference to the drawings.

The figure shows the implementation when the combustion device is installed facing upward.

In the figure, 1 is a cylindrical outer cylinder with a bottom,
A cabinet 2 smaller than the outer cylinder 1 is provided inside.

The inner tube 2 is open at both ends, and is installed at intervals from the side surface 11, the bottom surface 12, and the opening 13 surface of the outer tube 1 by means of an inner tube support rod 3.

It is preferable that the outer cylinder 1 and the inner cylinder 2 are installed concentrically so that the combustion gas can flow smoothly.

An air inlet pipe 4 is connected to the side surface 11 near the opening 13 in the upper part of the outer cylinder 1 toward the upper side of the inner cylinder 2 .

The air inlet pipe 4 is installed horizontally or slightly upwardly toward the center of the inner cylinder 2, and the air sent from the air inlet pipe 4 passes above the upper end of the inner cylinder 2 to the outside on the opposite side. It is designed to collide with the side surface 11 of the cylinder 1.

A fuel spray nozzle 5 is provided at the center of the bottom of the outer cylinder 1 so as to face upward into the inner cylinder 2.

As the spray nozzle 5, a high-pressure spray nozzle, an ultrasonic spray nozzle, or the like is used.

As shown in FIG. 3, when combustion air is introduced at a relatively high speed through the air inlet pipe 4, the air passes above the inner cylinder 2 and faces the air inlet pipe 4. Side surface 11 of outer cylinder 1
, some of it flows in the direction of the opening 13 of the outer cylinder 1, and the rest circulates in the gap between the circumferences of the inner cylinder 2 and the outer cylinder 1, and then flows towards the bottom of the outer cylinder 1 and flows down the lower part of the inner cylinder 2. The liquid flows through the inner cylinder 2 from the bottom to the top and circulates.

At this time, when the liquid fuel is sprayed from the spray nozzle 5 and ignited, the sprayed fuel particles burn in the vicinity of the upper end of the inner cylinder 2 and swirl caused by the air introduced from the air supply pipe 4. It is caught in the air flow, moves downward through the gap between the inner cylinder 2 and the outer cylinder 1 together with the combustion air, passes through the lower part of the inner cylinder 2, and circulates up inside the inner cylinder 2 again.

During this time, the fuel particles are heated by the combustion heat near the upper end of the inner cylinder 2 and the inner cylinder 2 heated by the combustion heat, and are vaporized in a short time.

Further, the draft force generated from the combustion gas after the fuel particles have been vaporized promotes the upward airflow within the inner cylinder 2, promoting circulation, and thus further promoting the vaporization of the fuel particles.

In this state, only a part of the combustion air introduced from the air supply pipe 4 is circulated through the gap between the inner cylinder 2 and the outer cylinder 1, so that the vaporized fuel is There is not enough oxygen in the inner cylinder 2, so combustion does not occur, but blue flame vaporization combustion occurs near the outer cylinder opening 13 where it is completely mixed with the fuel air from the air feed pipe 4.

Therefore, the velocity of the combustion air sent from the air inlet pipe 4 is made higher than the velocity of the rising gas from inside the inner cylinder 2 in order to involve and circulate the rising gas from the inner cylinder 2, and 1. It varies depending on the size and shape of the inner cylinder 2, the capacity of the spray nozzle 5, etc., but usually the rising gas velocity is 5 to 15
It is preferable to set it to about twice as much.

Blue flame vaporization combustion is possible even at 15 times or more, but the noise becomes louder.

Furthermore, if the upper end opening 13' of the outer cylinder 1 is narrowed as shown in Fig. 4, the combustion flame of fuel particles is prevented from being immediately sprayed outside the outer cylinder 1, and the At the same time, the time for swirling and circulation becomes longer, and more stable blue flame vaporization combustion is performed.

Furthermore, the narrow opening 13' of the outer cylinder 1 reduces the surface source of noise, and stable blue flame vaporization combustion eliminates combustion pulsation, resulting in extremely low noise. 0 Furthermore, if a plurality of small holes 21 are provided at the upper part of the periphery of the inner cylinder as shown in FIG. Inner cylinder 2 passes through small hole 21
circulated within.

Then, the mixed gas from the small hole 21 is further mixed with the circulating vaporized gas from the lower part of the inner cylinder 2 and the vaporized gas from the sprayed fuel, promoting uniformity of gas concentration and gas temperature, and immediately after ignition. The combustion state at the time of startup is stabilized, and the subsequent combustion state is also stable.

Further, as shown in FIG. 6, if the spray nozzle 5' is composed of a hollow horn connected to an ultrasonic vibrator 51,
The liquid fuel is atomized by ultrasonic vibration, resulting in particles of uniform size, which are easily caught up in the circulating air flow, resulting in stable vaporization.

Further, ultrasonic waves are preferable because the spray amount can be easily controlled and the output can be easily adjusted.

Incidentally, in each of the above embodiments, an example was shown in which the combustion device was installed facing upward, but it is also possible to install it facing downward or sideways.

As mentioned above, in the liquid fuel combustion device of the present invention, the liquid fuel sprayed from the spray nozzle is mixed with combustion air, circulated, heated by the combustion heat, and vaporized, so that the liquid fuel is vaporized in an extremely short period of time. Blue flame vaporization combustion can be obtained.

Therefore, instantaneous combustion control (starting, stopping) is easy, it can be applied to combustion devices with large output, and the generation of soot, odor, etc. is extremely low.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the liquid fuel combustion device of the present invention;
Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, Fig. 3 is a longitudinal sectional view illustrating the combustion state of one row of the liquid fuel combustion device of the present invention, and Fig. 4 is a sectional view of other liquid fuel combustion devices of the present invention. FIGS. 5 and 6 are vertical sectional views showing still other examples of the liquid fuel combustion apparatus of the present invention. DESCRIPTION OF SYMBOLS 1... Outer tube, 11... Side surface of outer tube, 12... Bottom surface of outer tube, 13, 13'... Opening of outer tube, 2... Inner tube, 4... Air supply Entry pipe, 5,5'...Fuel spray nozzle.

Claims (1)

[Claims] 1. An inner cylinder smaller than the outer cylinder is installed in a bottomed outer cylinder at a distance from the side, bottom and opening surfaces of the outer cylinder, and an inner cylinder is installed on the upper side of the outer cylinder. A liquid fuel combustion device characterized in that an air supply pipe is connected upward to the cabinet, and a fuel spray nozzle is provided at the bottom of the outer cylinder so as to face into the inner cylinder. 2. The liquid fuel combustion device according to claim 1, wherein the air inlet pipe is provided horizontally or slightly diagonally upward toward the center of the cabinet. 3. The liquid fuel combustion device according to claim 1 or 2, wherein the outer cylinder and the inner cylinder are installed concentrically. 4. The liquid fuel combustion device according to claims 1, 2, and 3, wherein the outer cylinder has a narrowed opening. 5. The liquid fuel combustion device according to claim 1, 2, 3, or 4, wherein the inner cylinder has a plurality of small holes in the upper part of its periphery. 6 Claims 1, 2, 3, and 4 in which the spray nozzle comprises a hollow horn connected to an ultrasonic vibrator.
The liquid fuel combustion device according to item 1 or 5.